Positioning system

The positioning system addresses errors in large elevation angle measurements by employing a correction calculator to switch between AoA and ToA techniques, ensuring accurate elevation angle determination through altitude and distance corrections.

US12481017B2Active Publication Date: 2025-11-25ALPS ALPINE CO LTD
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Patent Information

Application Number
US18/484757
Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
Priority Date
2022-10-20
Filing Date
2023-10-11
Publication Date
2025-11-25
Estimated Expiration
2044-08-06

AI Technical Summary

Technical Problem

Existing positioning systems using array antennas for measuring radio wave angles of arrival (AoA) experience increased phase difference errors when the elevation angle is large, leading to inaccuracies in determining the elevation angle.

Method used

A positioning system that includes an altitude measurement unit, a distance measurement unit, and a correction calculator to determine a correction value based on the difference between altitude and distance measurements, allowing for accurate elevation angle calculation using either the first elevation angle (based on AoA) or the second elevation angle (based on ToA) when the elevation angle exceeds a predetermined threshold.

Benefits of technology

The system reduces errors in measuring angles by using a correction value to switch between AoA and ToA techniques, ensuring accurate determination of elevation angles even at large angles, thereby improving positional accuracy.

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Abstract

A positioning system includes an elevation angle calculator that determines, as a second elevation angle, an inverse cosine of a first value, upon occurrence of a condition in which an absolute value of a first elevation angle is greater than or equal to a second predetermined angle, the second predetermined angle being greater than a first predetermined angle, the first value being obtained by dividing a second value that is obtained by correcting, with a correction value, an altitude measured by an altitude measurement unit, by a distance measured by a distance measurement unit. The elevation angle calculator selects any one of the first elevation angle and the second elevation angle, based on a value of the first elevation angle.
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